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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Sex·a·ges·i·mal a.  Pertaining to, or founded on, the number sixty.
 Sexagesimal fractions or Sexagesimal numbers Arith. & Alg., those fractions whose denominators are some power of sixty; as, called also astronomical fractions, because formerly there were no others used in astronomical calculations.
 Sexagesimal arithmetic, or Sexagenary arithmetic, the method of computing by the sexagenary scale, or by sixties.
 Sexagesimal scale Math., the sexagenary scale.

From: Webster's Revised Unabridged Dictionary (1913)

 As·tro·nom·ic·al a.  Of or pertaining to astronomy; in accordance with the methods or principles of astronomy.  -- As*tro*nom*ic*al*ly, adv.
 Astronomical clock. See under Clock.
 Astronomical day. See under Day.
 Astronomical fractions, Astronomical numbers. See under Sexagesimal.